The document provides technical specifications for a 4-channel ceiling fan controller by Messung Systems, which uses Modbus RTU for communication and allows control of fan speeds manually and remotely. It includes details on installation, operation, safety instructions, and communication protocols, featuring a protection mechanism and various operational parameters. It is designed for indoor use and can be mounted on a DIN rail within electrical distribution panels.

1. Messung Systems Pvt. Ltd.
501 Lunkad Sky Vista, Viman Nagar, Pune 411 014, India.
T:+91 20 6649 2800 | e: info@messung.com | w: www.messung.com
4 CH Ceiling Fan Controller-Modbus RTUTechnical Documentation
MOD-CFC-4
Features:
 4 Channel Ceiling Fan Controller
 Control up to 5 speed for each channel.
 Manual output operation with push button
 Total data saving on bus failure
 Din rail mount assembly
 DIP switch for Modbus RTU slave configuration
 No configuration software needed
 CE Mark
 Manual Push Button:
 1. FAN: Select Fan Channel to be operate
 2. STEP: Change speed of fan from 0 to 5
General Product Specifications:
Device Type Electric Operation control device
Main Supply Voltage (typical) 24VDC
Voltage Range 18-30 VDC
Connection type Pluggable Terminal Connector
Other External Supply 12VDC
Mains Voltage 230VAC (50 Hz), + 10 % -20%
Communication Interface &
Protocol
RS485 & MODBUS RTU
No. of Channel 4
Speed control for each
channel
Step 1 to 5 and OFF
Maximum recommended
load per output
90W
Protection Fuse protection on load side
IP Level IP20
Isolation Isolation between I/O and Logic
Operating Temperature 0 to 70 °C
Storage Temperature -25 °C to +75 °C
Ambient Humidity 5 to 95 % RH (no condensation)
Manual test facility 2 Push button switches - 1. Select Fan 2. Select Speed
Certification CE
Usage Indoor, to be mounted inside distribution boxes or electrical panels with DIN rail
Power ON response When power resumes, last fan speed and other settings will automatically apply.
Operation Indicator LED (RED) for DC power ON, Flickering Yellow LED to indicate communication,
GREEN LEDS (4 no’s) indicating fan channel selection

2. Messung Systems Pvt. Ltd.
501 Lunkad Sky Vista, Viman Nagar, Pune 411 014, India.
T:+91 20 6649 2800 | e: info@messung.com | w: www.messung.com
WIRING DIAGRAM
Modbus Configuration DIP switch access:
Steps:
1. Open the upper facia plate of the module.
2. Adjust the DIP switchaccording to requirements. Refer below image.
SAFETY INSTRUCTIONS
 Installation should only be performed by qualified professionals according to the laws and regulations.
 Do not connect the mains voltage nor any other external voltage to any point of the Modbus connector; it would
represent a risk for the entire system. The facility must have enough insulation between the mains (or auxiliary) voltage
and the Modbus or the wires of other accessories, in case of being installed.
 Keep the device away from water and do not cover it with clothes, paper or any other material while in use.
Modbus Communication Specifications:
Protocol Slave Modbus RTU
Baud Rate 9600,19200
Slave Address 1-15
Data bit 8
Stop bit 1
Parity None
Response time <100ms
Termination
Resistance
120ohms
Control registers
Holding Register 1 to 4 (Value-
0-5)
Distance Up to 1200m
Slave ID Configuration
DIP Switch
Slave
ID
1 2 3 4
1 OFF OFF OFF ON
2 OFF OFF ON OFF
3 OFF OFF ON ON
4 OFF ON OFF OFF
5 OFF ON OFF ON
6 OFF ON ON OFF
7 OFF ON ON ON
8 ON OFF OFF OFF
9 ON OFF OFF ON
10 ON OFF ON OFF
11 ON OFF ON ON
12 ON ON OFF OFF
13 ON ON OFF ON
14 ON ON ON OFF
15 ON ON ON ON
Termination resistor configuration
Termination
(120 ohm)
DIP Switch
5
ON ON
OFF OFF
Baud Rate configuration
Baud Rate DIP Switch
6
9600 OFF
19200 ON